Tuning the scale of α precipitates in β-titanium alloys for achieving high strength

Mantri, S.A.; Choudhuri, Deep; Alam, Talukder; Viswanathan, G.B.; Sosa, J.M.; Fraser, Hamish L.; Banerjee, Rajarshi

doi:10.1016/j.scriptamat.2018.05.040

Cited by 154 publications

(29 citation statements)

References 24 publications

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“…With high solution temperature and rapid cooling, it did not give enough time for β phase to transform into α phase. The hardness of α phase is higher than that of the β phase [43], meanwhile β phase has a higher hardness than the α' and α'' phases [44][45][46]. Thus it can be concluded that α phase has the highest hardness compared with other phase's hardness.…”

Section: Resultsmentioning

confidence: 94%

Effect of solution treatment on the microstructure and mechanical properties of Ti-6Al-6Mo hot-rolled alloy

Alfirano

Friandani

Sutowo

2019

JMES

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Titanium and its alloys are widely used in biomedical applications due to their unique combination of good hot workability, high specific strength and good corrosion resistance. In this study, elastic modulus, hardness and the effects of solution treatment on microstructures and mechanical properties of Ti-6Al-6Mo hot-treated alloy were investigated using OM (optical microscopy), XRD (X-ray diffractometry), SEM (Scanning electron microscopy), Ultrasonic testing and hardness testing. Previously, the sampels were hot-rolled at 900oC for 1 h with a total reduction of 50%,and then followed by air cooling. The samples were carried out solution treatment for 1 h at 850oC and 950oC, followed by water cooling and at temperature of 1050oC with water and air cooling. The results indicate that the hardness of the Ti-6Al-6Mo alloy increased with the increasing of solution treatment temperature on the water cooling, while the elastic modulus was decreased. The lowest elasticity modulus value and the highest hardness, 125.4 GPa and 46.3 RC were obtained at 1050oC with equiaxed micro structure and β' precipitate. XRD analysis exhibited the presence of α and β phases in Ti-6Al-6Mo alloys after solution treatment. Based on the relative intensity of XRD strongest peak analysis, the α phase intensity decreases with the increasing of solution treatment temperature, this phenomenon causes the decreasing of elasticity modulus value with the increasing of solution treatment temperature on water cooling medium.

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Section: Resultsmentioning

confidence: 94%

Effect of solution treatment on the microstructure and mechanical properties of Ti-6Al-6Mo hot-rolled alloy

Alfirano

Friandani

Sutowo

2019

JMES

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“…Extensive efforts have been paid on overcoming the strength-ductility trade-off dilemma. As for (α + β) titanium alloy, the most typical high-strength titanium alloy, the mechanical properties are expected to be largely dependent on the grain size, fraction, morphology and distribution of α phase [4,5]. High strength is usually associated with fine and dense α phase.…”

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confidence: 99%

“…High strength is usually associated with fine and dense α phase. For example, by refining the α size, Mantri et al [4] have tuned the ultimate tensile strength (UTS) of a Ti-15Mo-3Nb-2.7Al-0.2Si alloy from ∼ 1 to 1.9 GPa. However, the precipitation hardening of α precipitates may reduce the ductility.…”

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confidence: 99%

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Extraordinary tensile properties of titanium alloy with heterogeneous phase-distribution based on hetero-deformation induced hardening

Cao

Zhang

Liu

et al. 2020

Materials Research Letters

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A heterogeneous (α + β) titanium alloy with extraordinary tensile properties was prepared. The heterogeneous microstructures, consisting of soft β fiber and hard (α + β) matrix , were achieved by controlling the distribution of β-stabilizing element. The heterogeneous alloy exhibits ultra-high strength of 1634 MPa with reasonable ductility, which is much higher compared to the homogeneous counterpart. The plastic incompatibility of the β fiber and (α + β) matrix produces heterodeformation induced (HDI) hardening, which is the main reason for the enhanced strength. Moreover, the α-twining and martensitic transformation are responsible for the good ductility. This work provides a new strategy to achieve superior strength-ductility combination for multi-phase alloys. IMPACT STATEMENT Heterogeneous phase-distribution was realized in an (α + β) titanium alloy to achieve superior strength-ductility combination based on hetero-deformation induced hardening.

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“…In view of complexity for calculation of geometrical sizes of particles due to a resolution limitation of scanning-electron microscope, the number of particles per unit surface area of metastable βphase was calculated. In the approximation that an increase of dispersion of precipitates results in the decrease of its linear sizes and inter-particle distance the density of particles may serve as a criterion for comparison of dispersion of secondary α-phase in the different conditions of material [8]. Based on results of calculation of particles density the increase of cold work reduction does not result in the increase of dispersion of secondary α-phase at the same ageing temperature (Fig.…”

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confidence: 99%

The Difference between Hot and Cold Deformation and its Effect on Microstructure and Mechanical Properties of Near Beta Titanium Alloy

Grebenchshikov¹,

Ледер²,

Волков³

2020

MATEC Web Conf.

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An investigation of cold and hot deformation and the subsequent heat treatment including the annealing at the (α+β)- field temperature and ageing of VST55531 alloy showed that the material after the cold drawing without the heat treatment has the extremely low values of uniform elongation and during the tensile test the strain becomes localized at a neck upon 0.2 % strain. The ageing of coldworked material improves the strength and increases a limit of uniform deformation and generally has a beneficial effect on a strengthto-ductility ratio of alloy probably due to achieving a special morphology of secondary α-phase. The obtained values of the combination of strength and ductility in the cold-worked material at 50% strain reduction degree are 1 625 MPa for UTS, 8% - El, 36% - RA, that exceed significantly the values obtained for the hot-worked and as-annealed material, and are attractive for application in products that require the increased strength and ductile characteristics.

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Tuning the scale of α precipitates in β-titanium alloys for achieving high strength

Cited by 154 publications

References 24 publications

Effect of solution treatment on the microstructure and mechanical properties of Ti-6Al-6Mo hot-rolled alloy

Effect of solution treatment on the microstructure and mechanical properties of Ti-6Al-6Mo hot-rolled alloy

Extraordinary tensile properties of titanium alloy with heterogeneous phase-distribution based on hetero-deformation induced hardening

The Difference between Hot and Cold Deformation and its Effect on Microstructure and Mechanical Properties of Near Beta Titanium Alloy

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